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mtd_blkdevs: dequeue in-flight request 

mtd_blkdevs processes requests one-by-one synchronously from a kthread
and can be easily converted to dequeueing model.  Convert it.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2009-05-08 11:54:11 +09:00 committed by Jens Axboe
parent bab2a807a4
commit 1498ada7a8
1 changed files with 13 additions and 4 deletions
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17
drivers/mtd/mtd_blkdevs.c
View File

@ -89,18 +89,22 @@ static int mtd_blktrans_thread(void *arg)
{
struct mtd_blktrans_ops *tr = arg;
struct request_queue *rq = tr->blkcore_priv->rq;
struct request *req = NULL;
/* we might get involved when memory gets low, so use PF_MEMALLOC */
current->flags |= PF_MEMALLOC;
spin_lock_irq(rq->queue_lock);
while (!kthread_should_stop()) {
struct request *req;
struct mtd_blktrans_dev *dev;
int res;
req = elv_next_request(rq);
if (!req) {
req = elv_next_request(rq);
if (req)
blkdev_dequeue_request(req);
}
if (!req) {
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(rq->queue_lock);
@ -120,8 +124,13 @@ static int mtd_blktrans_thread(void *arg)
spin_lock_irq(rq->queue_lock);
__blk_end_request_cur(req, res);
if (!__blk_end_request_cur(req, res))
req = NULL;
}
if (req)
__blk_end_request_all(req, -EIO);
spin_unlock_irq(rq->queue_lock);
return 0;